Github user klopfdreh commented on the issue:
https://github.com/apache/wicket/pull/194
Hi @martin-g - this was because Objects.hashCode is only available since
idk > 7.
I replaced the call with a return 0; - this is done by
Objects.hashCode(null) anyway.
I also created a ticket for open-json to change the code so that there is a
"real" jdk 6 compatibility. ð
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